And just connect the headphone output from it into your LM386 amp. You can find them by looking up "bluetooth headphone adapter", and there's many different prices, sizes and shapes.

I've used one just like the one on the link, to have my Talk-A-Phone (tube-intercom-turned-guitar-amplifier) as a little "vintage boombox" to play some tunes when I'm relaxing at home, but I currently use it with a pair of Sony Ericsson Bass Reflex earbuds as my daily-driver bluetooth headset.